Java code to extract all files from a jar to a given location

Question

I want to copy all files inside jar file to outside the current directory.

Here is my code. It's writing all files name inside jar, so.. But I want to copy all the files from inside the jar to outside the jar.

import java.io.*;
import java.util.Enumeration;
import java.util.jar.*;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

   public class JarRead 
   {
     public static void main (String args[]) throws IOException 
     {
         ZipFile file = new ZipFile("jarfile.jar");
         if (file != null) {
            Enumeration<? extends ZipEntry> entries = file.entries(); 

            if (entries != null) {
               while (entries.hasMoreElements()) {
                   ZipEntry entry = entries.nextElement();
                   System.out.println(entry);

               }
             }
         }
     }
   }

Welcome to stackoverflow. Please use the edit link to clean up the multiple use of "..". — Micha Wiedenmann, Jul 18 '13 at 21:05
You can get an `InputStream` by calling `file.getInputStream(entry)`. — Brigham, Jul 18 '13 at 21:09
what you said, sorry, i didn't understand!! Please help me thanks!! — user2559055, Jul 18 '13 at 21:26
Duplicate of http://stackoverflow.com/questions/981578/how-to-unzip-files-recursively-in-java — Tinman, Jul 18 '13 at 21:58

score 0 · Answer 1 · answered Jul 18 '13 at 21:08

0

You do not need to write a Java program to do this. You could use a shell script. You could just unzip the jar file, and then find the files in the directory and mv them into the directory you have.

answered Jul 18 '13 at 21:08

Kaushik Shankar

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4

That's not the point. He wants to do it in Java, not a shell script. -1 – mattbdean Jul 18 '13 at 21:12
Well, i know, I can do without java program.. I want java program to do this acutally :) please help me thanks!! – user2559055 Jul 18 '13 at 21:27
OP specifies he doesn't need to use Java. +1 for balance – Tdorno Jul 18 '13 at 21:36
The unzip executable is an extra dependency the system may not have. – Sarel Botha Jul 18 '13 at 21:38
My apologies; I read "I want to copy all the files from inside the jar to outside the jar." and thought that the goal was what you were actually interested in, and not the code to do it. – Kaushik Shankar Jul 19 '13 at 00:29

score 0 · Answer 2 · answered Jul 18 '13 at 21:36

Here is a class that does this. You probably have to modify it a little.

public class HtDocsExtractor {
    private final String htDocsPath;

    public HtDocsExtractor(String htDocsPath) {
        this.htDocsPath = htDocsPath;
    }

    public void extract() throws Exception {

        InputStream is = HtDocsExtractor.class.getResourceAsStream("/htdocs.zip");
        ZipInputStream zis = new ZipInputStream(is);
        try {
            byte[] buf = new byte[8192];
            ZipEntry zipentry;

            zipentry = zis.getNextEntry();
            while (zipentry != null) {
                String entryName = htDocsPath + zipentry.getName();
                entryName = entryName.replace('/', File.separatorChar);
                entryName = entryName.replace('\\', File.separatorChar);
                int n;
                File newFile = new File(entryName);
                if (zipentry.isDirectory()) {
                    if (!newFile.exists() && !newFile.mkdirs()) {
                        throw new Exception("Could not create directory: " + newFile);
                    }
                    zipentry = zis.getNextEntry();
                }
                else {
                    FileOutputStream fos = new FileOutputStream(entryName);
                    try {
                        while ((n = zis.read(buf)) > 0) {
                            fos.write(buf, 0, n);
                        }
                    } finally {
                        fos.close();
                    }
                    zis.closeEntry();
                    zipentry = zis.getNextEntry();
                }
            }
        } finally {
            zis.close();
        }

    }
}

I think this is hard way to do it.. i need understand program.. acutally.. how its work?? If i changed file name htdocs.zip to my file name it should work right — user2559055, Jul 18 '13 at 21:46

Java code to extract all files from a jar to a given location

2 Answers2